Transformers When we generate power we ramp up the voltage for transmission (up to 100 000V) and then when it arrives at homes we ramp it back down for convenient use (120V). Say we need to transmit a certain amount of power (P = IV) a high voltage means a low current. since power lost by the wire due to resistance is Ploss = I2R low current means power loss is at a minimum
But how is this done? To convert voltage to a higher or lower value we use a ______________________. This is another important application of… A transformer consists of a _______________________ coil and a ________________________ coil. As current flows through the primary coil it produces a _________________ _________________. This magnetic field then induces an _____________________ ________________ in the secondary coil.
Note that transformers generally only work when using _______________ ___________________. If we use _________________ ______________ then we need to constantly switch the current on and off. When a transformer increases voltage it is called a… Note that a step up transformer has…
When a transformer decreases voltage it is called a… A step down transformer has…
Physics 12
Name: _______________________
To determine the voltage change we use the following: Where:
Vp = Vs = Np = Ns =
Although we may change the voltage, we must conserve _____________. Therefore, _________________ must also be conserved. So,
Example: A step transformer is used to convert 120V to 1.50x104 V. If the primary coil has 24 turns, how many turns does the secondary coil have?
Example: A step-up transformer has 1000 turns on its primary coil and 1x105 turns on its secondary coil. If the transformer is connected to a 120 V power line, what is the step-up voltage?
Example: A step-down transformer reduces the voltage from a 120 V to 12.0 V. If the primary coil has 500 turns and draws 3.00x10-2 A, a) What is the power delivered to the secondary coil?
Page 1 of 2. Physics 12 Name: Transformers. When we generate power we ramp up the voltage for transmission (up to 100 000V) and then when it arrives. at homes we ramp it back down for convenient use (120V). Say we need to transmit a certain amount of power (P = IV). a high voltage means a low current.
actually do the job we expect it to do. So then, I am about to show you the easiest way I know to find the IMPEDANCE BATIO. First of all, IMPEDANCE RATIO ALWAYS REMAINS THE SAME regardless of frequency and power fod through the transfof Imer. The IMP
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(0.625 A). 3) Near your home the voltage pf the power line is 3.6 x 103 V. The transformer between your home and the. line reduces this voltage to 1.20 x 102 V. If the transformer is to deliver 2.4 x 103. J of energy each second to. your house, what
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